public override void Draw(BoundingBox boundingBox, sbyte zoomLevel, ICanvas canvas, Point topLeftPoint)
{
long tileLeft = MercatorProjection.LongitudeToTileX(boundingBox.MinLongitude, zoomLevel);
long tileTop = MercatorProjection.LatitudeToTileY(boundingBox.MaxLatitude, zoomLevel);
long tileRight = MercatorProjection.LongitudeToTileX(boundingBox.MaxLongitude, zoomLevel);
long tileBottom = MercatorProjection.LatitudeToTileY(boundingBox.MinLatitude, zoomLevel);
int tileSize = this.displayModel.TileSize;
int pixelX1 = (int)(MercatorProjection.TileToPixel(tileLeft, tileSize) - topLeftPoint.X);
int pixelY1 = (int)(MercatorProjection.TileToPixel(tileTop, tileSize) - topLeftPoint.Y);
int pixelX2 = (int)(MercatorProjection.TileToPixel(tileRight, tileSize) - topLeftPoint.X + tileSize);
int pixelY2 = (int)(MercatorProjection.TileToPixel(tileBottom, tileSize) - topLeftPoint.Y + tileSize);
for (int lineX = pixelX1; lineX <= pixelX2 + 1; lineX += tileSize)
{
canvas.DrawLine(lineX, pixelY1, lineX, pixelY2, this.paintBack);
}
for (int lineY = pixelY1; lineY <= pixelY2 + 1; lineY += tileSize)
{
canvas.DrawLine(pixelX1, lineY, pixelX2, lineY, this.paintBack);
}
for (int lineX = pixelX1; lineX <= pixelX2 + 1; lineX += tileSize)
{
canvas.DrawLine(lineX, pixelY1, lineX, pixelY2, this.paintFront);
}
for (int lineY = pixelY1; lineY <= pixelY2 + 1; lineY += tileSize)
{
canvas.DrawLine(pixelX1, lineY, pixelX2, lineY, this.paintFront);
}
}
public static IList <TilePosition> GetTilePositions(BoundingBox boundingBox, sbyte zoomLevel, Point topLeftPoint, int tileSize)
{
int tileLeft = MercatorProjection.LongitudeToTileX(boundingBox.MinLongitude, zoomLevel);
int tileTop = MercatorProjection.LatitudeToTileY(boundingBox.MaxLatitude, zoomLevel);
int tileRight = MercatorProjection.LongitudeToTileX(boundingBox.MaxLongitude, zoomLevel);
int tileBottom = MercatorProjection.LatitudeToTileY(boundingBox.MinLatitude, zoomLevel);
int initialCapacity = (tileRight - tileLeft + 1) * (tileBottom - tileTop + 1);
IList <TilePosition> tilePositions = new List <TilePosition>(initialCapacity);
for (int tileY = tileTop; tileY <= tileBottom; ++tileY)
{
for (int tileX = tileLeft; tileX <= tileRight; ++tileX)
{
double pixelX = MercatorProjection.TileToPixel(tileX, tileSize) - topLeftPoint.X;
double pixelY = MercatorProjection.TileToPixel(tileY, tileSize) - topLeftPoint.Y;
tilePositions.Add(new TilePosition(new Tile(tileX, tileY, zoomLevel, tileSize), new Point(pixelX, pixelY)));
}
}
return(tilePositions);
}